Tiemoue Bakayoko, on loan from Chelsea, lost possession to Krzysztof Piatek in the penalty area and the ball ran to Christian Kouame whose shot from a narrow angle hit Romagnoli's foot and looped into the net.

Radu repeatedly foiled Milan with saves from Gonzalo Higuain, Franck Kessie and Suso, only to be undone by his poor judgement at the end.

Milan's second home win in four days was a huge relief for coach Gennaro Gattuso as it lifted his side into fourth place in Serie A -- and the Champions League spots -- with 18 points from 11 games.

"It's something important, considering all the gossip there has been and all the difficulties we have been through," said Gattuso.